Implemented version based on number of commits on HEAD day

1 files changed, 65 insertions, 0 deletions

diff --git a/datever.c b/datever.c
new file mode 100644
index 0000000..a8c63df
--- /dev/null
+++ b/datever.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#include <git2.h>
+
+
+static int must(const char* msg, int err);
+
+
+int
+main()
+{
+	git_libgit2_init();
+	git_repository* repo = NULL;
+	must("open repository", git_repository_open_ext(&repo, NULL, GIT_REPOSITORY_OPEN_FROM_ENV, NULL));
+	git_revwalk* walker = NULL;
+	must("walk revisions", git_revwalk_new(&walker, repo));
+	must("find HEAD", git_revwalk_push_head(walker));
+	git_oid oid;
+	char prev[37];
+	prev[0] = 0;
+	char date[37];
+	int count = 0;
+	while (0 == git_revwalk_next(&oid, walker)) {
+		git_commit* commit;
+		must("find commit", git_commit_lookup(&commit, repo, &oid));
+		const git_time_t gt = git_commit_time(commit);
+		const struct tm* const tm = gmtime(&gt);
+		if (NULL == tm) {
+			perror("read time");
+			exit(1);
+		}
+		snprintf(
+			date,
+			37,
+			"%d%02d%02d",
+			tm->tm_year + 1900,
+			tm->tm_mon + 1,
+			tm->tm_mday);
+		if (0 != prev[0]) {
+			if (0 == strncmp(prev, date, 37))
+				count++;
+			else break;  // Last commit is not deallocated!
+		}
+		strcpy(prev, date);
+		git_commit_free(commit);
+	}
+	printf("%s.%d\n", date, count + 1);
+}
+
+
+/// If [[err]] is considered erroneuos, print [[msg]] and the last libgit2 error to standard error and then terminate.
+int
+must(const char* msg, const int err)
+{
+	if (0 > err) {
+		const git_error* const e = git_error_last();
+		if (NULL != msg)
+			dprintf(2, "%s: ", msg);
+		dprintf(2, "%s\n", e->message);
+		exit(1);
+	}
+	return err;
+}